As people get older, their fitness level goes down due partially to indifference and also as a result of aging process. People in the age group of 60 - 80 come under this category.
Their problem associated with physical and mental health could be tackled in a well planned and scientific manner. Fitness is affected not merely by physical illness but additionally by mental stress. The issues are universal and similar if not identical, among all older persons, regardless of social or financial standing.
When we talk of physical health it's mostly a matter of proper diet and exercise. A doctor will say "Take a lot of vegetables, fruits, milk with rice or wheat preparations" to vegetarians and will add meat, poultry and fish to non-vegetarians. Helpful resources will also mention the proportion of every item.
The well to do can follow the doctor's instructions meticulously, provided they have the inclination to do so on a permanent basis. That will keep them out of harm's way. They are often free of stomach disorders and other related illness. The problem crops up for people who cannot afford what the doctor prescribes as diet. There is absolutely no solution in cases like this.
Light exercises are recommended for old people. Nothing will strain the aging parts of the body is allowed. The best type of exercise, for a senior citizen is really a brisk or ordinary walk, in accordance with his health and strength, both in the morning and evening.
You will have a marked reluctance to do exercises regularly and it cannot be avoided. It'll needless to say affect the fitness level. This goes for the diet also. Most aged people eat what they like however, not well for their system and end up in a clinic.
So, this can be a bit difficult task to keep themselves fit however the effort should be made by near and dear ones to enforce some form of discipline at least when it concerns diet. But, there is a completely different aspect for aged person losing fitness is mental trouble. It is mostly a feeling to be unwanted by the younger generation and consequent reluctance to take care of their health.

Old age homes though providing food, shelter and medical needs cannot help in this matter. Only love and affection from their children and other members can give solace in this problem. In fact in that situation the older persons may remain physically fit also.